Interlocking board.



No. 7l4,987. Patented Dec. 2, I902. n. w. WOLFE.

INTEBLOGKING BOARD.

(Application filed Feb. 17, 1902.)

(No Model.)

WITNESSES rrnn STATES PATENT OFFICE.

MARTIN VVILFORD WOLFE, OF NEW LEXINGTON, OHIO.

INTERLOCKING BOARD.

SPECIFICATION forming part of Letters Patent No. 714,987, dated December2, 1902.

To a whom it natty concern.-

Be it known that I, MARTIN WILFORD WOLFE, a citizen of the UnitedStates, and a resident of New Lexington, in the county of Perry andState of Ohio, have invented new and useful Improvements in InterlockingBoards, of which the following is a full, clear, and exact description.

The invention relates to carpentry; and its object is to provide certainnew and useful improvements in interlocking boards such as are used forcar-roofs, floors, ceilings, sid ings, decks of vessels, and the like,and whereby leakage is prevented and shrinkage is re duced to a minimum.

The invention consists of novel features and parts and combinations ofthe same, as will be more fully described hereinafter and then pointedout in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a perspective View of the improvement. Fig. 2 is an enlargedcross-section of one of the boards, and Fig. 3 is a like view of amodified form of the same.

Each of the interlocked boards A A A (shown in Fig. 1) is formed atopposite faces adjacent to the ends with longitudinally-extendingrecesses B and O, of which the recess 0 is deeper than the recess B, andthe latter is formed in its bottom with a longitudinallyextending grooveB, in which rises an integral tongue B as plainly indicated in Figs. 1and 2. From the bottom of the other recess (J rises a tongue 0,corresponding in shape to the groove B and provided at its top with alongitudinally-extending groove 0 corresponding in shape to the tongue BThe inner wall of the'recess O is formed with a beveled shoulder O and asimilar beveled shoulder B is formed in the bottom of the recess B atthe outer end thereof, as will be readily understood by reference toFig. 2. Now when the boards A, A, and A are jointed together then thetongue B of one board ongages the groove 0 of the adjacent board and thetongue 0 fits into the groove B and at the same time the beveledshoulders l3 and O interlock with each other, as will be read-Application filed February 17 1902. Serial No. 94,473. (No model.)

ily understood by reference to Fig. 1. Now by the arrangement describedthe interlocked double tongues and grooves O B and B O as Well as theinterlocked shoulders O B prevent the boards from moving apart, and atthe same time the said interlocked parts form such a tight joint as topreventleakage. By having the tongues C and B rounded off, as indicatedin the drawings, the various interlocking parts can be readily fittedtogether, and fastening devices, such as nails and the like, are notrequired to securely fasten adjacent boards to each other.

It is understood that the recesses, tongues, and grooves can be readilyformed in tonguingand-grooving machines.

In practice the boards are laid in white lead in the usual manner, andboards united as described prevent water or moisture from reaching thevital parts of the joint, as water that may possibly enter at theadjacent edges will be carried off at the interlocked beveled shoulders,and hence the water does not penetrate to or reach the double groovesand tongues. The latter extend about midway between the faces of theboards, and hence are to a great extent protected from climaticinfluences, and by the use of the interlocked tongues and groovesshrinkage is reduced to a minimum and the boards can only shrink in thedirection of their length. By having the double tongues and groovesextending in the direction of the thickness of the boards it is evidentthat the boards are not liable to open up at the interlocked sides, andas the tongues and grooves are very substantially built they readilyresist opening of the joint on shrinkage of the boards. By thearrangement described the boards can be readily jointed in a verticaldirection instead of sidewise, as heretofore practiced by the use ofboards having ordinary tongues and grooves.

The recess B on the under face of the board is made less deep than therecess 0, so that when the boards are jointed the top portion of thejoint is thicker than the bottom portion to withstand heavy strainsincident to moving loads over the jointed boards.

In the modified form shown in Fig. 3 the tongues B in the recess B andthe groove 0 in the tongue O of the board A are omitted; but otherwisethe construction is the same as the one above described and shown inFigs. 1 and 2.

Having thus described my invention, I claim as new and desire to secureby Letters Patent g 1. Aboard, provided on opposite faces adjacent toits side edges with recesses extending lengthwise of the board, therecess on one face of the board having its bottom formed with alongitudinal groove; the bottom of the other recess having an integraltongue, the inner side Walls of one of the recesses having a beveledshoulder, and the other recess being formed at its outer end with acorresponding shoulder, as set forth.

2. A board, provided on opposite faces adjacent to its side edges withrecesses extending lengthwise of the board, the recess on one face ofthe board having its bottom formed with a longitudinal groove; thebottom of the other recess having an integral tongue, the inner sidewalls of one of the recesses having a beveled shoulder, and the otherrecess being formed at its outer end with a corresponding shoulder, thesaid recesses being of different depths, as set forth.

3. A board, provided on opposite faces adjacent to its side edges, withrecesses extending lengthwise of the board, the recess at one face ofthe board having its bottom formed with a longitudinal groove and atongue rising in the groove, the bottom of the other recess having anintegral tongue formed with a longitudinal groove, as set forth.

4. A board, provided on opposite faces adjacent to its side edges, withrecesses extending lengthwise of the board, the recess at one face ofthe board having its bottom formed with a longitudinal groove and atongue rising in the groove, the bottom of the other recess having anintegral tongue formed with a longitudinal groove, the inner side wallof one of the recesses having a beveled shoulder and the other recessbeing formed at its outer end with a corresponding shoulder, as setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MARTIN WILFORD WOLFE.

Witnesses:

CHARLES C. GUY, A. B. MoKEEvER.

